Container closing machine with centering device



Mardl 1954 H. B. PETERSON ET AL ,6 7

CONTAINER CLOSING MACHINE WITH CENTERING DEVICE Filed March 28, 1952 sSheets-Sheet 1 INV EN TURS HOW/7P0 5. TEES O/I/ WWW:

A T TUBA/5Y5 March 23, 1954 H. B. PETERSON ET AL 2,672,791

CONTAINER CLOSING MACHINE WITH CENTE RING DEVICE Filed March 28, 1952 3Sheets-Sheet 2 Z iz I F f? 7/ f, O if I z i 5 2 if if id g i; I i} 16/ tINVENTORS HOW/42D B. PETEFSO/V EDA/4P0 0e 654E March 23, 1954 H. B.PETERSON ET AL 2,672,791

CONTAINER CLOSING MACHINE WITH CENTERING DEVICE WWW INVENTORS HOW/1E0 8.PTESO V EDWARD DeGfAE j HI II,

Patented Mar. 23, 1954 "CONTAINER CLOSING MAOHIN E WITH CENTERING DEVICE@Howard B. -=Peterson and Edwai-d De -Gear; San Francisco, Calif.;assignors to #American J'Ean .;:.CompanypNewmYork, N .3 Ya 1annrnoration of 1 N w-Jersey "Application March 28, 1952, .Serial No.279,114

(Cl.-:;93;3fl.2)

Claims.

The present invention relatesto a can-r conta'iner closingmachine andhas particuianreference to movable centering devices for centering and;daterally -supporting fibre or similar 1 containerscor containerbodiesreceived on the lifter pads-1ofthemachine preparatory to; attachingcovers on end anembers to' the containers'orwthe bodies.

Anobject of the invention is the provision in h a container clcisingmachine ofmovab-le centering devices which are associated with theiifter madsof thee machine and which are movable into nguidingaposition"above Ithe containersupporting a faee Of lthe pads to:"engage against;-.center,=-and r: supportJthei-ower end of a containerrec'eived on a. padufor fEIi-Z'VatiOn' into closing positionin the;machine.

Another; obj ect isithe, provision of such centeruing deviceszilwherein'the devices have: arcnate mevement sin; a i vertic'ah direction.adjacent the irlifter apadstso that ith-ey: disappeaistbeiowr the topUOI'JEZOHtBJiHBF supporting face of the made :to 1131'6- wventinterference Withlithe: feeding 'ot containers .aOIiwbOdiBS iontoithetpads.

Anotheruobject is the provisioniofivsuch. centerwing'ideviceswhereimtheideviees v areaactnated a into a: and: out-Jot centering 1position irelati-ve to; :thentop face of the lifter padsthroughvmovementrof :the quads into :andu out of; (container; closing:.pos'ition.

Arrcthernohiectr is the provision iof: suchcenterding sdvicesz wherein:the devices: move intovepera- IqfiVBiiilJO-SitiOh ;whi1e=, avlifterwpadisqelevatingh a acontainer or; aztbedvpintonelosing'ypositiomither'dedzvicesmovingain towardithe; icontainerwom b d-SD35sqithe latterrizises; thenebyeefiectingnar critic and ratralizing onitheacontainer: or; bedy ;on- ;the -:J-ift er a pad: and wirnparting; atfinalusettinenor =-;supe parting 1of-the-containerwor "body just as thli-iter wpad reaches:ithevpeakaof wit stroke to; properly :ilqcatmandhold: the-flower; end: OfgthQyQOlltflilflEI' or body-firm during; theaclosingr operation.

is lbtumeroustother objects-and advantages, ot the einvention wilt-he,:apparent: as it}?iSgbettGBfundY- nstdod jfIGIll-z the afnllowingndescription: which, etaken r in connection-L with-nthea accompanyingaazdrawings, discloses a tz-preterred embodiment nthereof.

? Refenringqto} thegdtawingsz wiFigure 1. is" a vertical section =takenthrp ugh a nconta'iner closing; machine-einbodyingithe instantwinvention With par-ts broken away;

:Fi M a plan" VieWi off the: contain rientran mportion of -;themachine-as ataken substantially among a horizon-taL 1 plane; K indicatedbyrxrthe, ,i-ine w-z-s-z -in' Eiga 1, {with partsabreken: away;

Fig. 3 is an enlarged sectional viewigofmthe n-principal parts 1of 1 a tcentering devicest" the wiew ibeing taken =substantiallyalong:ithewline1 3+3a=inwEigsa 2 Hig. 4 sis anaexpiodediperspectivemviewi of: athe parts embodiedsinxthe centering devices;

*Figs 5 and :fiaare enlarged elevations not] the lifter. pads and their:associatedmcentening :c-devices ithemwo eviews: showing"difierentnpositicns oftthel parts -.invo1ved; rand Fig; 71 is anenlarged 'gelevationx ofvthe 3.0pl305it8 side .of :lthek devicessshown:in Figs: S QHIIIdf-"S-LWPthe view showing one position of thecenteningsdevice-in dull lines. and another positiomimdqtted in lines.

As a preferred '1 or: the instant ,inventi exemplary embodiment ofone-vthe drawingswillustrate wean; ore containe .,.:el.0si!, 1 machineof theicharactemdiscl sed in F'gw 3;:of 1 United States Patent2,039,3381ssued May, 5 1936,

r170 R; E. J:; IJordquist onqvacuum :ClosingxMachine i 24, 194%, ton: EJr:N rdqu t O .-Qa ;-C Qsin 1; Machine.

for frozen food preducts cecpa q bodies Alvare received r and UnitedStates :Patent 2,541525iissued August Th machine illu t at d t n i hadmwin sa des d to a tach; m t la ect nenlar en h t fi r e ta u ;zqont nnhedi aa land 2). [wedd d-co tain s; qmmq 'ifi e t i ent niw v t nant-1m: W911; ers wm n bedi ean oth h p Q R xIn JG IiQJ it In such acl-osingamaehine the fi cessional order along, a horizontal iguiglvv 5|I (Fig. 2) 7 formed in a tablej2; (see a1so il jigc l) supported on abase-l3 whichvcornprises a partpf the vmain frame. of the machine.Awpair pf spaced and parallel, guidev rails 5, lfi disposed adjacent the.runvvawl I maintainthebddies A in processionaL order.

; double chain conveyoml 8 -;(Figs( Land 2);;

The bodies; A aretadvaneed,alqng the rnnyqa l i v in spaced andati edrelationi by-, an ndless ilin 9 which project;laterally, tram the feeddogs a c v y n th runwav andae aee-he ind th .iwbcdies Ayt e in. HThe;COILYQYOIVJ'IQJS" disposed parallel with the runwayr Lair-1d it n i.rides upon,- a track 2 I embedded 1 23 married won a; drive wearing fore n e h i. .d v n continu -tine, n h ;,as that disclosed in theaNordqnist [1 ;Patent 2,447,525 mentioned The conveyor operates above.ihewontainenubediesAiadvan edi ele gath runway H are directed toward arotating horizontal turret 21 having a hub 28 (Fig. 1) mounted on astationary vertical shaft 29 secured in the frame of the machine. Theturret is rotated continuously in time with the conveyor W by way of agear 3| which is keyed to the lower end of the hub 28.

The turret 21, adjacent its outer periphery carries a plurality oflifter devices 32 (Fig. l) of the character disclosed in Fig. 3 of theNordquist Patent 2,039,338 above mentioned. These lifter devices 32comprise vertically movable stems 33 which slide in bearing blocks. 35secured to the turret. A dust cap 35 is secured to the top of the stemand extends down around the outside of the bearing block. The dust capsupports a rectangular shaped lifter pad. which projects up from the capand which terminates in a fiat top face 31 which is in a horizontalplane flush with the runway H when the lifter pad moves past the runwayso as to receive and support a container body A from the runway as willbe hereinafter more fully explained.

The lower end of each of the lifter stems 33 carries a pair of camrollers 38, 33 which operate against a pair of co-operating stationarycam tracks 48, d2 formed in the base 53 and surrounding the stationaryshaft 23 so that as the turret rotates around the shaft 23, the camrollers traverse the cam tracks and thus raise and lower the lifterdevices in time with the operation of the machine, as in the NordquistPatent 2,039,338.

Above each lifter device 32, the upper end of the turret hub 28 carriesan end member supporting ring which receives, a container end member inany suitable manner for attachment to a. container body A. Each ring. isspaced just below a conventional closing head 48 for receiving the endmember and the upper end of the container body A to unite them in asuitable seam. There is one closing head for each lifter device 32 andthey are carried on an turret 41 resting on and rotating with the turrethub 28 around the stationary shaft 2%. The heads shown in the drawingsare commonly known as die seamer heads as contradistinguished from theroller type closing head shown in the Nordquist patents above mentioned.

Hence as the turret 21 rotates, it carries each of the lifter devices 32in succession past the terminal end of the runway and momentarilypositions its lifter pad 35 in direct alignment with the runway H asbest shown in Fig. 2. While the lifter pad 35 is passing into and out ofthis alignment, without stopping, the conveyor I8 by way of one of itsfeed dogs i3 advances a container body A from the runway onto the lifterpad. Continued rotation of the turret 21 carries the lifter pad 35 withits container body A through a curved path of travel away from therunway. During this travel of the turret 21, the cam tracks 4!, 42 raisethe lifter pad 35 and its container body A so that the upper end of thebody will pick up the end closure member in the support ring 45 andcarry it up into the closing head 45 for attachment to the body asmentioned hereinbefore.

In order to properly locate the container body A in a center position onthe flat top face 31 of the lifter pad 36 when the body is received fromthe runway I I, each lifter pad 35 is provided with a pair ofoscillatable centering and support fingers 5| (Figs. 3, 4, 6 and 7). Thelifter pad 36 is rectangular in shape to correspond substantially to therectangular shape of the container body A and is slightly larger thanthe body, and there are two of the centering fingers 5| for each lifterpad, one disposed along each longitudinal side of the lifter pad. Thesides and ends of the lifter pad are vertical and straight.

Each centering finger'5l is a wide bell crank shaped member having acontinuous upper centering edge 52 which extends along the full lengthof the longitudinal sides of the lifter pad 36. The lower edge of eachfinger is rounded and forms a slide edge 53. This edge, at the middle ofthe finger is cut away to provide a clearance recess 54 for the outerend of a rocker arm 55. There are two rocker arms 55 for each lifter pad33 and their outer ends are pivotally connected to the fingers 5| bypivot pins 56. The inner ends of the two rocker arms 55 extend into arecess 51 in the lifter pad 36 and are mounted on pivot pins 53 whichextend through the lifter pad and the recess.

Adjacent one end of the lifter pad 35, the slide edges 53 of the twofingers 51 are secured to the outer ends of a pair of short tensionsprings 59 (Fig. 7). The inner ends of the springs 59 are secured to apin 65 secured in the lifter pad 38 adjacent its lower edge and near itscenter. These springs 59 keep the slide edges 53 of the fingers infrictional engagement with the outer longitudinal vertical faces of thelifter pad as best shown in Fig. '7.

Adjacent the opposite end of the lifter pad 35, the rocker arm pivotpins 58 extend beyond the lifter pad and carry a pair of meshing spurgears 62 (Figs. 5 and 6) to provide oscillation of the rocker arms 55 inunison to move the centering fingers 5! through an arc terminating belowand above the container supporting face 31 of the lifter pad 36. One ofthe pivot pins 58 is longer than the other and also carries an actuatinglever 63 which is keyed to the pin. The outer end of this actuatinglever 63 is pivotally connected to the upper end of a link 64 which atits lower end is pivotally connected to a stationary block 65 bolted tothe turret 21. Thus the lower end of the link is fixed while the upperend is freely movable, with the result that the link can swing on itsfixed lower end.

The normal positions of the centering finger members are shown in Fig. 5in which the lifter pad 36 is at its lowermost level with its top face31 flush with the runway II and with the centering fingers 5| in adepressed or lowered position adjacent the sides of the lifter pad 35and well below the top face 31 of the pad. The parts are in thesepositions when the lifter pad 35 passes the terminal end of the runway ll and. receives a container body A therefrom without in anywayinterfering with the centering fingers 5 I Figure 5 showing the newlyreceived body in a slightly off-center relation to the lifter pad.

As soon as the lifter pad 36 passes beyond the runway II it starts itsupward travel to lift the body into position in the closing head 5b.With this rise of the lifter pad, the inner end of the actuating lever63 rises with the pad while its outer end, connected to the link 64tends to remain stationary. This action rotates the pivot pin 58connected to the actuating lever 53 and thus through the gears 62 whichare at all times in mesh, rotates both pivot pins 58 in oppositedirections. The rotation of the pivot pins 58 swing the rocker arms 55upwardly in unison and thus cause the centering fingers 5| to swingupwardly through an arc toward the top 31 of the lifter pad 35.

rlgsinceitheilowenor;islideiedgeszfi3z'otitheicentering fingers are keptin engagementwith the-vertiecalisides 'of :the lifteripadi 3$,.theyimove= upwardly sing aizstraighte line. andnthiszcausesw theupper.- .or ;.:centeri;ng. edges5210fthefingersto swing/through z.antarc. :whichrfirst, carriesithem away trom the lifteripad and: second,:swingscthem :inwardlyzover ;.:the topLifaCe 3 k .of rrthe.liftenipadiiwiand whence gtowardcaeach; othens. gentlyo engagingscthelongiutudinalisides 'of; theibody A 1 and pushing the body .1from;1therofiesetiposition showniin' Fig.2 5iinto a centralized;position on .cthe vlifteripad; :as: shown (sin; Eigi 6.

'1 This centralizingaof the .bodyieAv on: ethedifter spad'fifiitakesplace \justibeforeethe: top: end of; the

'bodyi -reaches; the endmember; support iringi d5 so athat the: bodwis;substantially; \locatedibeforet it -entersithe1'ing .as mentionedhereinbefore; Durring thewremaining. short tdistancegthez. body Ar-iswraised, rthezupper endpassing through the closure asupport ringzr lii;pickingiup :the: closure and pre- ;.senting.: the top portion of i thebodyiwith rthe closure; to theiclosing iheadzi lfi. The lifter ipadefit--continues to; rise.- -and=zthe icenteringiifingerse; 5| :continue topress against :the body and thereby -ifirmly= ;.support it iduring gthe: ,closingeoperation.

This winward travel however in is. slight, and: gentle ihecausei of theangular. 1 position of the actuating -1ever 3: relativehtoi the;link 54.as 1 will beyseenn by .irefereneeito: Fig. 6.

m-With such an arrangement of links and: levers. a simple gentle,harmonic: motion vis set uprin ithe .mocker arms 55 andtheicenteringfingers 5lwhich aiprovides for: anrapidorisesoftheafingersi. as: .the

actuating lever G3 moves-from its substantially rhorizontalupositionasshowminvfiig. 5. illAsithe iactuatingi lever 183 approachesuitsw morevertical position as shown in" Fig. 6 its turningiefiect on the: rockerharmsir fis visiconsiderably slower and :hence ..the1 inward travel. iof:the fingers .toward each otheniscorrespondingly slower. v: It. is for"this reason that. the final firm supportriof; the body A is efiectedtatsubstantially; the end of: the upstroke of the lifter pad and'in agentle manner.

*Af-ter --theclosing --operation takes place; the a litter pad 3 6descends to it its original position i and accordingly the centeringfingers- -move down below the top of the lifter pad to' their "originalposition adjacent its vertical side *faces; and

*thuspermit the discharge of the closedbody and the reception of a newunclosed body "without any wayinterfering with "the transfer of" thebody -from' and tothe lifter pad.

""It is thought that the'invention and many of -its-attendantadvantageswill be understoodfrom t "the'foregoing description; anditwill be apparent that various changesmay be made in' the form,construction and arrangementqof' the parts'without departing from thespirit and scope of the invention or sacrificingtall of its materialadvantages, the form hereinbefore described being merely a; preferredembodiment thereof.

lqlnia machine for attaching endmembersto tubular container bodies, thecombination of a vertically'movable liftergpad, having a supporting facefor receiving and supporting a container body for the attachment. of anend member thereto, means for raising and lowering said lifter pad,meansefer feeding a container body to saidteontainer supporting face ofthe lifterjpad swhen pthe latter is iniowered position, meansi-orattachingian end member-to saidgcontainenbody whenzsaidiifter pad isin-raisedposition; means i m ischareins th nta n n wit a ndezmemtbemthusattachediiiromi said 1' lit-tenpad whem the islattereisa again: lowered;a pair of" centerii-igv fingers pivotally mounted on said l-ifter pad onopoposite sides rthere'of it a and. movable wentically 5sthrough'@amarcsterminating =belowand aboveiithe container supporting.-face of saidilifterspadgand iactuatingimeans "for swingingisaid'fingerszinto a "position .belowsthensupporting tfaceanof 'said'rliiter"-padi-toiz freeasaidiafacez ofsinterference ploy usaid o-ofingerswhentaicontainenbodysis receivedronrsa'id iifaceteiromssaidteedingameanst andilwhen it=-=is vremovedr therefrom:sbynsaid:discharging means zyand ionzrswinging; zsaidofingersiintoz appositionsabove sanduoverlapping: theesnpportingnfacesoi.said'zliiteripadtog-engage.andacentralizecsaid coniatEiHGJ-UOII:saidface :whilerthe lifteri'padsissbeing :uiaised.

.2; Int armachine for :attachingzendzmemberseto tubular :acontainerbodies, .;.the; combinationsxofa a -:-.ventical1ymovablezliitenpadihaving. ansupporting face;dorrzreceivingiandsvsupportings a: container --bodyu:ior:ithe attachmentmof. antendizmember theret o;:.means forraising andlo-wering saidliftrrnadmmeansu fomieedins a: containembodwiio i.gsaidg,containerazsupportingg:face ,;of the. lifter pad WhenitheLlatter .is :in-lowered position; meansifor attachingianiendtmembertoqsaid container-:body 'J'Wheni saidrliftermad:isqiir-raisedmositionameans sfor dischargingthe::containemwith-an endlmemlatter is,again lowered; a: pain of: cent-eringafingersipivotally'zmountedonisaidqlifterwpad 0mm ipositewisides ithereof and; movabler-ivertically -:I:throughian1arc terminating belowqand; above thecontainer srsupportingi rfacevof ;.wsaid-diiter pad, .imeansconnectingsaidifingers ior swin in sthem sin; unison,-;and actuating-means :fonswinging said fingers into a DOSilSiOIIDBIOW'thBfiHQDQIEipgiace qOf saidilifter. pad tonfree. said, face 1 ofsinterference soiubyisazidifingerswhen; a ncontameizwbodyi r v -on: said. face from saidieedinggmeans and when tit removed1=therefrom Joya said n-discharging:meanszandior; swinging ,said fingers inter a posiitionabove;and-overlapping the r supporting-face 4 5) ;of,-said-, lifter:=padttosen agetandr centralize :said container ronwsaid facet whilewthe,lifter; pad-sis .beine-rraised.

j 3: Inaawmachine for,attaching-.-.endi members-toatubular;:eontainer:bodies; thepcombinationiof t. a verticallmmovableilifter pad havina a su porting .face ,for. receivingv andsupporting a container body, ior .,the... attachment .i of maneendmember thereto, means ,forraisingiand lowering saidilifter pad, meansfor feeding, a container bodyi ;to said container supporting face of.the lifter pad when'the latter is in lowered position, means forattaching anend member: to said containerbody when; said lifter" padisin" raised position, means for" discharging*thecontainer-withan end mem-150 per thus-attached fromsaidlifter pad when the -1atterisag'aindowered; apair=of rockers-arms pivotally --mounted on said" liftenpadeon opposite sides thereof= and movable-vertically through ian arcterminating below and above the iconitaineizsupporting face .iofssaicl:lifter :pad a ceniteringa fingeremountedsonceachzn. of ssaidizrdcker 1arms andrmovablezwith: saidearmsathrough said are, ar-idsactuatingimeans: 'for' swingingigsaid; finigers into. a:positionibelowuthez supporting fa;ce ref '7 said lif-te1 '-ipad wtq-free said iface 10ft interference (by, said zfin ers rwhen ascontainerwbodyiis i revceived on said face :from said {feeding means-andwhen it sisiremovedi therefrom discharging: Fmeans and ion swinginsaid-fingers into-Ha 1 .positiOnsabcwe and c overlapping-irtheasupporting face of said lifter pad to engage and centralize saidcontainer on said face while the lifter pad is being raised.

4. In a machine for attaching end members to tubular container bodies,the combination of a vertically movable lifter pad having a supportingface for receiving and supporting a container body for the attachment ofan end member thereto, means for raising and lowering said lifter pad,means for feeding a container body to said container supporting face ofthe lifter pad when the latter is in lowered position, means forattaching an end member to said container body when said lifter pad isin raised position, means for discharging the container with an endmember thus attached from said lifter pad when the latter is againlowered, a pair of pivot pins mounted in said lifter pad, a pair ofrgcker arms mounted one on each of said pivot pins and eX- tending inopposite directions beyond said lifter pad and movable verticallythrough an arc terminating below and above the container supporting faceof said lifter pad, a centering finger mounted on each of said rockerarms and movable with said arms through said arc, a pair of meshinggears mounted on said pivot pins for swinging said rocker arms and thefingers carried thereon in unison, and actuating means for swinging saidfingers into a position below the supporting face of said lifter pad tofree said face of intereference by said fingers when a container body isreceived on said face from said feeding means and when it is removedtherefrom by said discharging means and for swinging said fingers into aposition above and overlapping the supporting face of said lifter pad toengage and centralize'said container on said face while the lifter padis being raised.

5. In a machine for attaching end members to tubular container bodies,the combination of a vertically movable lifter pad having a supportingface for receiving and supporting a container body for the attachment ofan end member thereto, means for raising and lowering said lifter pad,means for feeding a container body to said container supporting face ofthe lifter pad when the latter is in lowered position, means forattaching an end member to said container body when said lifter pad isin raised position, means for discharging the container with an endmember thus attached from said lifter pad when the latter is againlowered, a pair of rocker arms pivotally mounted on said lifter pad onopposite sides thereof and movable vertically through an arc terminatingbelow and above the container supporting face of said lifter pad, acentering finger pivotally mounted on each of said rocker arms andmovable with said arms through said arc, said centering fingers havingan upper centering edge and a lower slide edge, pressure means operableagainst said fingers for maintaining said slide edges in slidingengagement with the sides of said lifter pad for controlling the arcuatemovement of the centering edges of said fingers, and actuating means forswinging the centering edge of said fingers into a position below thesupporting face of said lifter pad to free said face of interference bysaid fingers when a container body is received on said face from saidfeeding means and when it is removed therefrom by said discharging meansand for swinging the centering edge of said fingers into a positionabove and overlapping the supporting face of said lifter pad to engageand centralize said container on said face while the lifter pad is beingraised.

6. In a machine for attaching end members to tubular container bodies,the combination of a vertically movable lifter pad having a supportingface for receiving and supporting a container body for the attachment ofan end member thereto, means for raising and lowering said lifter pad,means for feeding a container body to said container supporting face ofthe lifter pad when the latter is in lowered position, means forattaching an end member to said container body when said lifter pad isin raised position, means for discharging the container with an endmember thus attached from said lifter pad when the latter is againlowered, a pair of centering fingers pivotally mounted on said lifterpad on opposite sides thereof and movable vertically through an arcterminating below and above the container supporting face of said lifterpad, an actuating arm for moving said fingers through said arc, and alink pivotally connected at one end to said actuating arm and at itsopposite end to a fixed member whereby the lowering of said lifter padswings said fingers into a position below the supporting face of saidlifter pad to free said face of interference by said fin gers when acontainer body is received on said face from said feeding means and whenit is removed therefrom by said discharging means and the raising ofsaid lifter pad swings said fingers into a position above andoverlapping the supporting face of said lifter pad to engage andcentralize said container on said face while the lifter pad is beingraised.

'1. In a machine for attaching end members to tubular container bodies,the combination of a vertically movable lifter pad having a supportingface for receiving and supporting a container body for the attachment ofan end member thereto, means for raising and lowering said lifter pad,feeding means disposed at a level with the supporting face of saidlifter pad when in its lowered position for advancing said containerbody into position onto said face, closing means disposed remotely fromsaid feeding means for receiving and attaching an end member to saidbody when said lifter pad is in its raised position, means fordischarging the container with a thus attached end member from saidlifter pad when the latter is again lowered, a pair of centering fingerspivotally mounted on said lifter pad on opposite sides thereof andmovable through an arc terminating below and above the containersupporting face of said lifter pad, and actuating means for swingingsaid fingers into a position below the supporting face of said lifterpad to free said face of interference by said fingers when a containerbody is received on said face from said feeding means and when it isremoved therefrom by said discharging means and for swinging saidfingers into a position above and overlapping the supporting face ofsaid lifter pad to engage and centralize said container on said facewhile the lifter pad is being raised.

HOWARD B. PETERSON. EDWARD DE GEAR.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,932,416 Lutz Oct. 31, 1933 2,039,338 Nordquist et al. May 5,1936 2,258,611 I-Iothersall Oct. 14, 1941 2,335,213 Lawrence Nov. 23,1943

